Abstract
Legumes have been used for their nitrogen fixation properties; however, farmers in tropical countries they do not usually use them, because they do not appreciate visible improvement in the soil. The aim of this paper was to analyse the effect of three tropical legumes (Phaseolus vulgaris, Canavalia ensiformis and Clitoria ternatea) on growth promoting microorganisms [Free Life Nitrogen Fixers Bacteria (FLNFB), Azospirillum sp., Azotobacter sp. and Arbuscular Mycorrhizal Fungi (AMF) on the fertility of two rhizospheric soils; one for rangeland use (Ru) and the other for agricultural use (Au). The bioassays were established under a completely randomized design with three replicates per species. The evaluated soil properties were pH; Organic matter, OM; Total carbon, TC; Total nitrogen, N; Useful Phosphorus, P; Cation Exchange Capacity, CEC; and texture. In rhizospheric soil the populations of FLNFB, Azospirillum sp. and Azotobacter sp.; as well as AMF spores were estimated. The results indicate that Ph. vulgaris was the species that showed lower N fixation in Au soil, but higher P content was found in Ru. Ca. ensiformis and Cl. ternatea had higher N fixation, increased CEC, OM and TC. Clitoria ternatea favored the accumulation of OM and TC, promoting CEC, pH and the AMF population. Canavalia ensiformis was the only species to promote differentiated development of Azospirillum sp. and Azotobacter sp. in Ru, showing higher populations with this legume. Therefore, it is recommended that these data can be considered for the conservation of tropical species, both legumes and native microorganisms.
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Claims 7
Claim · model-written summary
Phaseolus vulgaris showed lower N fixation in agricultural soil.
Verbatim
e0“Ph. vulgaris was the species that showed lower N fixation in Au soil”
t0“Phaseolus vulgaris”
Claim · model-written summary
Phaseolus vulgaris had higher P content in rangeland soil.
- Taxon
- Phaseolus vulgaris
Phaseolus vulgarist0 - Outcome
- P contente0
- Direction
- highere0
- Setting
- Rue0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“higher P content was found in Ru”
t0“Phaseolus vulgaris”
Claim · model-written summary
Canavalia ensiformis had higher N fixation and increased CEC, OM and TC.
Verbatim
e0“Ca. ensiformis and Cl. ternatea had higher N fixation, increased CEC, OM and TC”
Claim · model-written summary
Clitoria ternatea had higher N fixation and increased CEC, OM and TC.
Verbatim
e0“Ca. ensiformis and Cl. ternatea had higher N fixation, increased CEC, OM and TC”
Claim · model-written summary
Clitoria ternatea favored OM and TC accumulation, CEC, pH and AMF population.
- Taxon
- Clitoria ternatea
Clitoria ternateae0 - Interactor
- AMFe0symbiont
- Outcome
- accumulation of OM and TC, promoting CEC, pH and the AMF populatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Clitoria ternatea favored the accumulation of OM and TC, promoting CEC, pH and the AMF population”
Claim · model-written summary
Canavalia ensiformis promoted higher Azospirillum sp. populations in rangeland soil.
- Taxon
- Canavalia ensiformis
Canavalia ensiformise0 - Interactor
- Azospirillum sp.
Azospirillume0symbiont - Outcome
- Azospirillum sp.e0
- Direction
- highere0
- Setting
- Rue0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Canavalia ensiformis was the only species to promote differentiated development of Azospirillum sp. and Azotobacter sp. in Ru, showing higher populations with this legume”
Claim · model-written summary
Canavalia ensiformis promoted higher Azotobacter sp. populations in rangeland soil.
- Taxon
- Canavalia ensiformisCanavalia ensiformise0
- Interactor
- Azotobacter sp.
Azotobactere0symbiont - Outcome
- Azotobacter sp.e0
- Direction
- highere0
- Setting
- Rue0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Canavalia ensiformis was the only species to promote differentiated development of Azospirillum sp. and Azotobacter sp. in Ru, showing higher populations with this legume”